Boring-tool.



F. THOMAS.

BORING TOOL.

APILIOATION' FILED 113.10, 1908.

930,436. 1 Patented Aug. 10,1909.

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UNITED STATES PATENT OFFICE.

FREDERIOK THOMAS, OF WIGAN, ENGLAND, AS SIGNOR OF ONE-HALF TO WALKERBROTHERS,

WIGAN, LIMITED,

OF WIGAN, ENGLAND.

BORING-TOOL.

Specification of Letters Patent. Application filed'February 10, 1908.

Patented Aug. 10, 1909.

Serial No. 415,146.

To all whom it may concern:

Be it known that I, FREDERICK THOMAS, a subject of the King of GreatBritain, residing in \Nigan, in the county of Lancaster, in the Kingdomof England, engineenhave invented certain new and useful Improvements inBoring-Tools, for which application has been made in Great Britain, No.3,762, dated February 15, 1907.

My invention relates to an improved tool for boring longitudinal holesthrough metal shafts and the like, or for removing incrustation frompipes.

In the drawings Figure 1 is a sectional elevation of my improved boringtool; Fig. 2, a plan view; Fig. 3, an end elevation of the boring head;Figs. 4' and 5, are sectional views showing slight modifications.

In Figs. 1 and 2 a, designates the boring tool holder having atransverse slot to re ceive the cutter at 'its'front end; I), the bit orcutter; 0, front end to receive the cutter; d, the pin by which thecutter is pivoted to the bolt, and e', the nut which securesthe bolt 0and the cutter 1) in the slot in the tool holder, and clamps the wholein place, and affords means for releasing the cutter without removingthe holder from the machine. In Figs. 1, 2 and 3 the bolt is solid. Onthe tool holder (1, I form a head a, and this head is just a little lessin diameter, say one sixty-fourth of an inch or thereabout, than thewidth of the cut ter 5 so as to leave a slight clearance. To allow theborings to pass the tool head a), as the cutter bores its way into ametal shaft or the like, I cut away the tool head a at a on each side ofthe cutter b, so as to allow the the bolt which is also slotted at itsborings to pass freely from the cutting side, to the reduced diameter ofthe tool holder 11 at the back of the cutting head (1 In Fig. 5, 0represents a hollow bolt, the object of which is to allow the suds andoil to pass through the holder a and the head a, to the cutter 5 securedto the hollow bolt 0 by means of the pin (1 In Fig. 4 the bolt 0 is alsomade hollow for the same purpose as that of the bolt 0 in Fig. 5. InFig. 4 the holder 01' is made separate from the head a, and is connectedtherewith by having a threaded extension head. A pin (1 secures thecutter b to the bolt 0 on the head a, as is done in the other views.

I declare that what I claim is 1. An improved boring tool, consisting ofa tubular tool holder with a head, a bolt extending lengthwise in theholder provided with a transverse end slot, a cutterpivotally mounted inthe slot and arranged to bear against the head with its entire faceexposed, and means for securing the bolt to the holder. 2. An improvedboring tool, comprising a holder, a detachable head mounted on theholder, a bolt provided with a slot for receiving a cutter, a cutterpivoted in the slot, and means forholding the cutter against the headfor securing the head to the holder.

In witness whereof, I have hereunto signed my name this 1st day ofFebruary 1908, in the presence of two subscribing witwhich screws intothe

